This Alcon replacement caliper is the left-side unit specified for the Ford Raptor Big Brake Kit (from BKF1559BE11). Offered as a direct replacement for the original kit components, it lets owners service or rebuild the kit without purchasing a full new assembly. The description identifies it as the left caliper for that specific big brake kit.
Alcon Ford Raptor Big Brake Kit Replacement Caliper (From BKF1559BE11) - Left